Mass immigration = large amount of immigration into a country/countries. In the West it started since the 1950's, and it's gotten more & more ever since, now to the point of absurdity, with literally more than a million third world immigrants flooding into Europe annually. And what's the left's response? To tell us there's nothing to worry about because it will make Europe more 'diverse', which they claim is a strength. But you're unaware of this, because you live under a rock.
If diversity via mass immigration is a strength today, it should've also been a strength in ancient times, and also medieval times. But apparently this ground-breaking discovery was only made in the past few decades by Western 'progressive' politicians. Incredible to think that such great minds who came before them couldn't work that out!
Eh? I gave you a link to a video and told you to watch the first one and a half minutes. That's all. I also said you should watch the rest of the video to see the 'diversity is a strength' mantra get torn to shreds, but that was optional. The first minute and a half was a selection of clips of Western politicians repeating the 'diversity is a strength' line, because you're unaware of the left's support for diversity via mass immigration. But you didn't even read any of the links either, even after asking for a source.
Why are you even still replying? I've literally destroyed every single response you've given. You leftists just don't know when to give up.